package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    /**
     * 开始时间戳
     */
    public static final long BEGIN_TIMESTAMP = 1672531200L;
    public static final long COUNT_BITS = 32L;

    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        // 生成序列号
        //获取当前日期
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        String key = "icr:"+keyPrefix+":"+date;
        long count = stringRedisTemplate.opsForValue().increment(key);
        // 拼接并返回

        return  timestamp<<COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2023, 1, 1, 0, 0, 0);
        long l = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("l = " + l);
    }
}
